Cards that hold money.

　　Cards that provide safe access to a network.

　　Cards that allow setting stop boxes on televisions to remain safe from privacy.

　　Optical Memory Cards look like cards with a piece of CD on the top.Optical Memory Cards can store up to 4MB of data. But once written, the data can not be changed or removed. Thus, this type of card is good for keeping records, such as medical files, driving records or travel histories.Today, these have no processors in them(although this is coming in the near future)．While the cards are almost as cheap as chip cards, the card readers are expensive.

　　Title：21.________ Cards

　　Types 22.__________ Disadvantages Similarities

　　IC Chip Cards A larger memory & better

　　23. ________ & hold data Not mentioned Popularity；Large30.________；Low cost of cards

　　Optical 24._______Cards 25.________，drivers and

　　26.________ to keep records，but 27.________ not much 28.____________ data；No processors；Expensive card 29.________

　　1.D

　　2.B

　　3.B

　　4.C

　　5.B

　　6.B

　　7.A

　　8.B

　　9.B

　　10.B

　　11.A

　　12.D

　　13.B

　　14.A

　　15.A

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